Johnson, E. L., & Karim, M. A. (1987). Digital design: A pragmatic approach. PWS Engineering.
Lua i Stíl Chicago (17ú heag.)Johnson, Everett L., agus Mohammad A. Karim. Digital Design: A Pragmatic Approach. Boston: PWS Engineering, 1987.
Lua MLA (8ú heag.)Johnson, Everett L., agus Mohammad A. Karim. Digital Design: A Pragmatic Approach. PWS Engineering, 1987.
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